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애기다시마 식물의 미세구조 연구. : Ⅰ. 고정액 조성 I. Composition of Fixatives
정익교 부산대학교 기초과학연구소 1990 부산대학교 기초과학연구소 연구논문집 Vol.10 No.-
There have been many problems like plasmolysis in the ultrastructural studies with kelps. The present study was conducted with series of different fixatives and buffer solutions and several resins to solve the plasmolysis phenomena. The fixative of 1470 mosmol(3% glutaraldehyde. 2.4% paraformaldehyde in 0.05M cacodylate buffer with 0.2M sucrose and 0.5% caffeine at pH of 7.2) showed the least frequency of plasmolysis. The relationshiop between the concentration of primary fixatives and the frequency of plasmolysis was not found. With above fixative the possibility of Generally, the kelp (Laminaria religiosa) contains as lot of mucilage, which interupts the infiltration of fixative. The posiible physiological mechanisms related with mucilage secretion may be unable to fix region of plasmalemma properly.
초음파 기법을 활용한 콘크리트 구조물의 내부 균열 검출
김태식,신동익,진교홍,진치섭 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-
최근, 콘크리트 구조물(터널, 고가교 등)에서의 박리 및 낙하사고 등으로 콘크리트 구조물에 대한 유지관리시스템의 중요성이 재인식되었다. 콘크리트 구조물의 유지관리 및 보수시 조사·분석해야 할 가장 중요한 결함 요인은 콘크리트의 균열이다. 콘크리트의 균열은 내부에 발생하지만 구조적으로 문제가 없는 경우도 상당수 있으므로 종합적으로 분석하여 상태를 평가해야 하며 균열 상태는 폭, 깊이, 방향, 형상의 측면에서 조사 분석해야 한다. 이중 균열 깊이가 구조물의 안전거동에 미치는 영향이 큰 경우에는 콘크리트에 발생된 균열 깊이를 정확히 측정하여 정도에 따른 적절한 대책을 수립해야 한다. 본 연구에서는 콘크리트에 이미 발생된 균열의 초음파 탐상검사 방법으로 측정된 결과를 이해하기 쉽도록 3차원으로 화상처리 하는데 목적이 있다. 이를 위해, 서로 다른 균열 형상의 12가지 시험편을 제작하고 초음파 탐상검사 방법으로 균열 깊이를 측정한 후 균열 형상을 화상처리 할 수 있는 프로그램을 작성하였다. Cracks of concrete structure must be analyzed and estimated synthetically in order to have a maintenance and to insure the safety and the durability of structure. Concrete cracks have to be surveyed with respect to depth, width, shape and direction, but crack depth and shape among these items are not measured easily. Occasionally, it needs to measure the crack depth and shape of concrete structure for the purpose of evaulating the safe capacity and the necessity of repair. Therefore, experiments were carried with three-dimensional(3D) Ultra-Sonic Technique to detection and analysis crack shape in concrete and this report is performed to veritf the applicability and the accuracy of Ultra-Sonic Technique in non-destructive testing methods. Moreover, the result shows that the measurement of crack in concrete is related to the shape and angle of inclination of notch.
김형일,김종렬,안호경,장명익,설효정,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
The age-hardening behavior of a commercial dental casting low-carat gold alloy was investigated by means of differential thermal analysis, hardness test, optical microscopic observation and X-ray diffraction study. The following results were obtained. 1. By the isothermal aging of this alloy at 300∼400℃, the hardness increased markedly at the initial stage and continued to increased gradually for the time, and then decreased dractically after longer aging time. 2. The hardening was attributed to the formation of the metastable AuCu I' ordered phase from the α matrix. 3. The overaging with softening was attributed to the precipitation of the fine lamellar structure which was composed of the Ag-rich α1 and AuCu I ordered phases.
김형일,김영근,장명익,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1
The relationship between the isothermal age-hardening behavior and the phase transformation process in a dental casting Au-Ag-Cu-Pd alloy was investigated by means of hardness test, X-ray diffraction study. 1. The isothermal age-hardening behavior in the 350∼450℃ temperature range showed a similar tendency in the changes. However, the initial hardening was faster and the maximum hardness was higher and the overaging with softening was slower on aging at the lower temperature. 2. By the isothermal aging at 350∼450℃, the metastable Ag-rica α₁’and AuCu Ⅰ’orderd phases were formed from the supersaturated α phase prior to the final formation of the equilibrium Ag-rich α₁’and AuCu Ⅰordered phases. 3. By aging at 450℃, the age-hardening was attributed to the lattice strains of the parent phases resulting from the transformation of the αphase resulting from the transformation to the metastable phases. The X-ray diffraction peaks of the αphase showed a distinct shift toward both the high and low diffraction angles during transformation.
The Effects of Heavy Metals in Seaweeds
Chung, Ik Kyo,Lee, Jin Ae 부산대학교 기초과학연구소 1990 부산대학교 기초과학연구소 연구논문집 Vol.10 No.-
The present brief review focuses on some toxic effects of heavy metals in seaweeds. There have not been much studies on the effects of heavy metals in seaweeds. However, their effects are significant on their growth rate, morphology and other metabolic processes. Therefore, the possible impacts on the coastal community with respect to the primary productivity and the energy flow should not be underestimated. Seaweeds are able to accumulate some metals without any toxic effects. The uptake of some metal species in seaweeds has been explained by the adsorption/ion-exchange mechanism of various polysaccharides like alginate, the energy required processes, and other kinetic models. Some seaweeds have been considered as indicators of heavy metal pollution because of their capability of accumulation. Comprehensive biological studies of suitable species and their tissue contents of heavy metals should be prerequisite background for the implication of those species as bioindicators The concentrations of heavy metals(Cd,Cu,Zn,Pb,Fe,Cr,Co,Ni,Hg,As,Sr)in seaweeds of 33(including 6 unidentified) species of Chlorophyta, 50 (11) of Rhodophyta and 73(14) of Phaeophyta are listed in this review. Among these Enteromorpha, Ulva, Gracilaria, Polysiphonia, Ascophyllum, Fucus, Laminaria and Sargassum are frequently reported algal species.
Chung, Ik Kyo,Oak, Jung Hyun,Lee, Jin Ae,Shin, Jong Ahm,Kim, Jong Gyu,Park, Kwang-Seok Oxford University Press 2013 ICES journal of marine science Vol.70 No.5
<P> Seaweed beds can serve as a significant carbon dioxide (CO<SUB>2</SUB>) sink while also satisfying global needs for food, fodder, fuel, and pharmaceutical products. The goal of our Korean Project has been to develop new baseline and monitoring methodologies for mitigation and adaptation within the context of climate change. Using innovative research approaches, we have established the Coastal CO<SUB>2</SUB> Removal Belt (CCRB), which comprises both natural and man-made plant communities in the coastal region of southern Korea. Implemented on various spatial–temporal scales, this scheme promotes the removal of CO<SUB>2</SUB> via marine forests. For example, when populated with the perennial brown alga <I>Ecklonia</I>, a pilot CCRB farm can draw down ∼10 t of CO<SUB>2</SUB> per ha per year. This success is manifested by an increment in biomass accumulations and a decrease in the amount of dissolved inorganic carbon in the water column.</P>